--- /dev/null
+/*
+ * mxuport.c - MOXA UPort series driver
+ *
+ * Copyright (c) 2006 Moxa Technologies Co., Ltd.
+ * Copyright (c) 2013 Andrew Lunn <andrew@lunn.ch>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Supports the following Moxa USB to serial converters:
+ * 2 ports : UPort 1250, UPort 1250I
+ * 4 ports : UPort 1410, UPort 1450, UPort 1450I
+ * 8 ports : UPort 1610-8, UPort 1650-8
+ * 16 ports : UPort 1610-16, UPort 1650-16
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/firmware.h>
+#include <linux/init.h>
+#include <linux/jiffies.h>
+#include <linux/serial.h>
+#include <linux/serial_reg.h>
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/tty_driver.h>
+#include <linux/tty_flip.h>
+#include <linux/uaccess.h>
+#include <linux/usb.h>
+#include <linux/usb/serial.h>
+#include <asm/unaligned.h>
+
+/* Definitions for the vendor ID and device ID */
+#define MX_USBSERIAL_VID 0x110A
+#define MX_UPORT1250_PID 0x1250
+#define MX_UPORT1251_PID 0x1251
+#define MX_UPORT1410_PID 0x1410
+#define MX_UPORT1450_PID 0x1450
+#define MX_UPORT1451_PID 0x1451
+#define MX_UPORT1618_PID 0x1618
+#define MX_UPORT1658_PID 0x1658
+#define MX_UPORT1613_PID 0x1613
+#define MX_UPORT1653_PID 0x1653
+
+/* Definitions for USB info */
+#define HEADER_SIZE 4
+#define EVENT_LENGTH 8
+#define DOWN_BLOCK_SIZE 64
+
+/* Definitions for firmware info */
+#define VER_ADDR_1 0x20
+#define VER_ADDR_2 0x24
+#define VER_ADDR_3 0x28
+
+/* Definitions for USB vendor request */
+#define RQ_VENDOR_NONE 0x00
+#define RQ_VENDOR_SET_BAUD 0x01 /* Set baud rate */
+#define RQ_VENDOR_SET_LINE 0x02 /* Set line status */
+#define RQ_VENDOR_SET_CHARS 0x03 /* Set Xon/Xoff chars */
+#define RQ_VENDOR_SET_RTS 0x04 /* Set RTS */
+#define RQ_VENDOR_SET_DTR 0x05 /* Set DTR */
+#define RQ_VENDOR_SET_XONXOFF 0x06 /* Set auto Xon/Xoff */
+#define RQ_VENDOR_SET_RX_HOST_EN 0x07 /* Set RX host enable */
+#define RQ_VENDOR_SET_OPEN 0x08 /* Set open/close port */
+#define RQ_VENDOR_PURGE 0x09 /* Purge Rx/Tx buffer */
+#define RQ_VENDOR_SET_MCR 0x0A /* Set MCR register */
+#define RQ_VENDOR_SET_BREAK 0x0B /* Set Break signal */
+
+#define RQ_VENDOR_START_FW_DOWN 0x0C /* Start firmware download */
+#define RQ_VENDOR_STOP_FW_DOWN 0x0D /* Stop firmware download */
+#define RQ_VENDOR_QUERY_FW_READY 0x0E /* Query if new firmware ready */
+
+#define RQ_VENDOR_SET_FIFO_DISABLE 0x0F /* Set fifo disable */
+#define RQ_VENDOR_SET_INTERFACE 0x10 /* Set interface */
+#define RQ_VENDOR_SET_HIGH_PERFOR 0x11 /* Set hi-performance */
+
+#define RQ_VENDOR_ERASE_BLOCK 0x12 /* Erase flash block */
+#define RQ_VENDOR_WRITE_PAGE 0x13 /* Write flash page */
+#define RQ_VENDOR_PREPARE_WRITE 0x14 /* Prepare write flash */
+#define RQ_VENDOR_CONFIRM_WRITE 0x15 /* Confirm write flash */
+#define RQ_VENDOR_LOCATE 0x16 /* Locate the device */
+
+#define RQ_VENDOR_START_ROM_DOWN 0x17 /* Start firmware download */
+#define RQ_VENDOR_ROM_DATA 0x18 /* Rom file data */
+#define RQ_VENDOR_STOP_ROM_DOWN 0x19 /* Stop firmware download */
+#define RQ_VENDOR_FW_DATA 0x20 /* Firmware data */
+
+#define RQ_VENDOR_RESET_DEVICE 0x23 /* Try to reset the device */
+#define RQ_VENDOR_QUERY_FW_CONFIG 0x24
+
+#define RQ_VENDOR_GET_VERSION 0x81 /* Get firmware version */
+#define RQ_VENDOR_GET_PAGE 0x82 /* Read flash page */
+#define RQ_VENDOR_GET_ROM_PROC 0x83 /* Get ROM process state */
+
+#define RQ_VENDOR_GET_INQUEUE 0x84 /* Data in input buffer */
+#define RQ_VENDOR_GET_OUTQUEUE 0x85 /* Data in output buffer */
+
+#define RQ_VENDOR_GET_MSR 0x86 /* Get modem status register */
+
+/* Definitions for UPort event type */
+#define UPORT_EVENT_NONE 0 /* None */
+#define UPORT_EVENT_TXBUF_THRESHOLD 1 /* Tx buffer threshold */
+#define UPORT_EVENT_SEND_NEXT 2 /* Send next */
+#define UPORT_EVENT_MSR 3 /* Modem status */
+#define UPORT_EVENT_LSR 4 /* Line status */
+#define UPORT_EVENT_MCR 5 /* Modem control */
+
+/* Definitions for serial event type */
+#define SERIAL_EV_CTS 0x0008 /* CTS changed state */
+#define SERIAL_EV_DSR 0x0010 /* DSR changed state */
+#define SERIAL_EV_RLSD 0x0020 /* RLSD changed state */
+
+/* Definitions for modem control event type */
+#define SERIAL_EV_XOFF 0x40 /* XOFF received */
+
+/* Definitions for line control of communication */
+#define MX_WORDLENGTH_5 5
+#define MX_WORDLENGTH_6 6
+#define MX_WORDLENGTH_7 7
+#define MX_WORDLENGTH_8 8
+
+#define MX_PARITY_NONE 0
+#define MX_PARITY_ODD 1
+#define MX_PARITY_EVEN 2
+#define MX_PARITY_MARK 3
+#define MX_PARITY_SPACE 4
+
+#define MX_STOP_BITS_1 0
+#define MX_STOP_BITS_1_5 1
+#define MX_STOP_BITS_2 2
+
+#define MX_RTS_DISABLE 0x0
+#define MX_RTS_ENABLE 0x1
+#define MX_RTS_HW 0x2
+#define MX_RTS_NO_CHANGE 0x3 /* Flag, not valid register value*/
+
+#define MX_INT_RS232 0
+#define MX_INT_2W_RS485 1
+#define MX_INT_RS422 2
+#define MX_INT_4W_RS485 3
+
+/* Definitions for holding reason */
+#define MX_WAIT_FOR_CTS 0x0001
+#define MX_WAIT_FOR_DSR 0x0002
+#define MX_WAIT_FOR_DCD 0x0004
+#define MX_WAIT_FOR_XON 0x0008
+#define MX_WAIT_FOR_START_TX 0x0010
+#define MX_WAIT_FOR_UNTHROTTLE 0x0020
+#define MX_WAIT_FOR_LOW_WATER 0x0040
+#define MX_WAIT_FOR_SEND_NEXT 0x0080
+
+#define MX_UPORT_2_PORT BIT(0)
+#define MX_UPORT_4_PORT BIT(1)
+#define MX_UPORT_8_PORT BIT(2)
+#define MX_UPORT_16_PORT BIT(3)
+
+/* This structure holds all of the local port information */
+struct mxuport_port {
+ u8 mcr_state; /* Last MCR state */
+ u8 msr_state; /* Last MSR state */
+ struct mutex mutex; /* Protects mcr_state */
+ spinlock_t spinlock; /* Protects msr_state */
+};
+
+/* Table of devices that work with this driver */
+static const struct usb_device_id mxuport_idtable[] = {
+ { USB_DEVICE(MX_USBSERIAL_VID, MX_UPORT1250_PID),
+ .driver_info = MX_UPORT_2_PORT },
+ { USB_DEVICE(MX_USBSERIAL_VID, MX_UPORT1251_PID),
+ .driver_info = MX_UPORT_2_PORT },
+ { USB_DEVICE(MX_USBSERIAL_VID, MX_UPORT1410_PID),
+ .driver_info = MX_UPORT_4_PORT },
+ { USB_DEVICE(MX_USBSERIAL_VID, MX_UPORT1450_PID),
+ .driver_info = MX_UPORT_4_PORT },
+ { USB_DEVICE(MX_USBSERIAL_VID, MX_UPORT1451_PID),
+ .driver_info = MX_UPORT_4_PORT },
+ { USB_DEVICE(MX_USBSERIAL_VID, MX_UPORT1618_PID),
+ .driver_info = MX_UPORT_8_PORT },
+ { USB_DEVICE(MX_USBSERIAL_VID, MX_UPORT1658_PID),
+ .driver_info = MX_UPORT_8_PORT },
+ { USB_DEVICE(MX_USBSERIAL_VID, MX_UPORT1613_PID),
+ .driver_info = MX_UPORT_16_PORT },
+ { USB_DEVICE(MX_USBSERIAL_VID, MX_UPORT1653_PID),
+ .driver_info = MX_UPORT_16_PORT },
+ {} /* Terminating entry */
+};
+
+MODULE_DEVICE_TABLE(usb, mxuport_idtable);
+
+/*
+ * Add a four byte header containing the port number and the number of
+ * bytes of data in the message. Return the number of bytes in the
+ * buffer.
+ */
+static int mxuport_prepare_write_buffer(struct usb_serial_port *port,
+ void *dest, size_t size)
+{
+ u8 *buf = dest;
+ int count;
+
+ count = kfifo_out_locked(&port->write_fifo, buf + HEADER_SIZE,
+ size - HEADER_SIZE,
+ &port->lock);
+
+ put_unaligned_be16(port->port_number, buf);
+ put_unaligned_be16(count, buf + 2);
+
+ dev_dbg(&port->dev, "%s - size %zd count %d\n", __func__,
+ size, count);
+
+ return count + HEADER_SIZE;
+}
+
+/* Read the given buffer in from the control pipe. */
+static int mxuport_recv_ctrl_urb(struct usb_serial *serial,
+ u8 request, u16 value, u16 index,
+ u8 *data, size_t size)
+{
+ int status;
+
+ status = usb_control_msg(serial->dev,
+ usb_rcvctrlpipe(serial->dev, 0),
+ request,
+ (USB_DIR_IN | USB_TYPE_VENDOR |
+ USB_RECIP_DEVICE), value, index,
+ data, size,
+ USB_CTRL_GET_TIMEOUT);
+ if (status < 0) {
+ dev_err(&serial->interface->dev,
+ "%s - usb_control_msg failed (%d)\n",
+ __func__, status);
+ return status;
+ }
+
+ if (status != size) {
+ dev_err(&serial->interface->dev,
+ "%s - short read (%d / %zd)\n",
+ __func__, status, size);
+ return -EIO;
+ }
+
+ return status;
+}
+
+/* Write the given buffer out to the control pipe. */
+static int mxuport_send_ctrl_data_urb(struct usb_serial *serial,
+ u8 request,
+ u16 value, u16 index,
+ u8 *data, size_t size)
+{
+ int status;
+
+ status = usb_control_msg(serial->dev,
+ usb_sndctrlpipe(serial->dev, 0),
+ request,
+ (USB_DIR_OUT | USB_TYPE_VENDOR |
+ USB_RECIP_DEVICE), value, index,
+ data, size,
+ USB_CTRL_SET_TIMEOUT);
+ if (status < 0) {
+ dev_err(&serial->interface->dev,
+ "%s - usb_control_msg failed (%d)\n",
+ __func__, status);
+ return status;
+ }
+
+ if (status != size) {
+ dev_err(&serial->interface->dev,
+ "%s - short write (%d / %zd)\n",
+ __func__, status, size);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+/* Send a vendor request without any data */
+static int mxuport_send_ctrl_urb(struct usb_serial *serial,
+ u8 request, u16 value, u16 index)
+{
+ return mxuport_send_ctrl_data_urb(serial, request, value, index,
+ NULL, 0);
+}
+
+/*
+ * mxuport_throttle - throttle function of driver
+ *
+ * This function is called by the tty driver when it wants to stop the
+ * data being read from the port. Since all the data comes over one
+ * bulk in endpoint, we cannot stop submitting urbs by setting
+ * port->throttle. Instead tell the device to stop sending us data for
+ * the port.
+ */
+static void mxuport_throttle(struct tty_struct *tty)
+{
+ struct usb_serial_port *port = tty->driver_data;
+ struct usb_serial *serial = port->serial;
+
+ dev_dbg(&port->dev, "%s\n", __func__);
+
+ mxuport_send_ctrl_urb(serial, RQ_VENDOR_SET_RX_HOST_EN,
+ 0, port->port_number);
+}
+
+/*
+ * mxuport_unthrottle - unthrottle function of driver
+ *
+ * This function is called by the tty driver when it wants to resume
+ * the data being read from the port. Tell the device it can resume
+ * sending us received data from the port.
+ */
+static void mxuport_unthrottle(struct tty_struct *tty)
+{
+
+ struct usb_serial_port *port = tty->driver_data;
+ struct usb_serial *serial = port->serial;
+
+ dev_dbg(&port->dev, "%s\n", __func__);
+
+ mxuport_send_ctrl_urb(serial, RQ_VENDOR_SET_RX_HOST_EN,
+ 1, port->port_number);
+}
+
+/*
+ * Processes one chunk of data received for a port. Mostly a copy of
+ * usb_serial_generic_process_read_urb().
+ */
+static void mxuport_process_read_urb_data(struct usb_serial_port *port,
+ char *data, int size)
+{
+ int i;
+
+ if (!port->port.console || !port->sysrq) {
+ tty_insert_flip_string(&port->port, data, size);
+ } else {
+ for (i = 0; i < size; i++, data++) {
+ if (!usb_serial_handle_sysrq_char(port, *data))
+ tty_insert_flip_char(&port->port, *data,
+ TTY_NORMAL);
+ }
+ }
+ tty_flip_buffer_push(&port->port);
+}
+
+static void mxuport_msr_event(struct usb_serial_port *port, u8 buf[4])
+{
+ struct mxuport_port *mxport = usb_get_serial_port_data(port);
+ u8 rcv_msr_hold = buf[2] & 0xF0;
+ u16 rcv_msr_event = get_unaligned_be16(buf);
+ unsigned long flags;
+
+ if (rcv_msr_event == 0)
+ return;
+
+ /* Update MSR status */
+ spin_lock_irqsave(&mxport->spinlock, flags);
+
+ dev_dbg(&port->dev, "%s - current MSR status = 0x%x\n",
+ __func__, mxport->msr_state);
+
+ if (rcv_msr_hold & UART_MSR_CTS) {
+ mxport->msr_state |= UART_MSR_CTS;
+ dev_dbg(&port->dev, "%s - CTS high\n", __func__);
+ } else {
+ mxport->msr_state &= ~UART_MSR_CTS;
+ dev_dbg(&port->dev, "%s - CTS low\n", __func__);
+ }
+
+ if (rcv_msr_hold & UART_MSR_DSR) {
+ mxport->msr_state |= UART_MSR_DSR;
+ dev_dbg(&port->dev, "%s - DSR high\n", __func__);
+ } else {
+ mxport->msr_state &= ~UART_MSR_DSR;
+ dev_dbg(&port->dev, "%s - DSR low\n", __func__);
+ }
+
+ if (rcv_msr_hold & UART_MSR_DCD) {
+ mxport->msr_state |= UART_MSR_DCD;
+ dev_dbg(&port->dev, "%s - DCD high\n", __func__);
+ } else {
+ mxport->msr_state &= ~UART_MSR_DCD;
+ dev_dbg(&port->dev, "%s - DCD low\n", __func__);
+ }
+ spin_unlock_irqrestore(&mxport->spinlock, flags);
+
+ if (rcv_msr_event &
+ (SERIAL_EV_CTS | SERIAL_EV_DSR | SERIAL_EV_RLSD)) {
+
+ if (rcv_msr_event & SERIAL_EV_CTS) {
+ port->icount.cts++;
+ dev_dbg(&port->dev, "%s - CTS change\n", __func__);
+ }
+
+ if (rcv_msr_event & SERIAL_EV_DSR) {
+ port->icount.dsr++;
+ dev_dbg(&port->dev, "%s - DSR change\n", __func__);
+ }
+
+ if (rcv_msr_event & SERIAL_EV_RLSD) {
+ port->icount.dcd++;
+ dev_dbg(&port->dev, "%s - DCD change\n", __func__);
+ }
+ wake_up_interruptible(&port->port.delta_msr_wait);
+ }
+}
+
+static void mxuport_lsr_event(struct usb_serial_port *port, u8 buf[4])
+{
+ u8 lsr_event = buf[2];
+
+ if (lsr_event & UART_LSR_BI) {
+ port->icount.brk++;
+ dev_dbg(&port->dev, "%s - break error\n", __func__);
+ }
+
+ if (lsr_event & UART_LSR_FE) {
+ port->icount.frame++;
+ dev_dbg(&port->dev, "%s - frame error\n", __func__);
+ }
+
+ if (lsr_event & UART_LSR_PE) {
+ port->icount.parity++;
+ dev_dbg(&port->dev, "%s - parity error\n", __func__);
+ }
+
+ if (lsr_event & UART_LSR_OE) {
+ port->icount.overrun++;
+ dev_dbg(&port->dev, "%s - overrun error\n", __func__);
+ }
+}
+
+/*
+ * When something interesting happens, modem control lines XON/XOFF
+ * etc, the device sends an event. Process these events.
+ */
+static void mxuport_process_read_urb_event(struct usb_serial_port *port,
+ u8 buf[4], u32 event)
+{
+ dev_dbg(&port->dev, "%s - receive event : %04x\n", __func__, event);
+
+ switch (event) {
+ case UPORT_EVENT_SEND_NEXT:
+ /*
+ * Sent as part of the flow control on device buffers.
+ * Not currently used.
+ */
+ break;
+ case UPORT_EVENT_MSR:
+ mxuport_msr_event(port, buf);
+ break;
+ case UPORT_EVENT_LSR:
+ mxuport_lsr_event(port, buf);
+ break;
+ case UPORT_EVENT_MCR:
+ /*
+ * Event to indicate a change in XON/XOFF from the
+ * peer. Currently not used. We just continue
+ * sending the device data and it will buffer it if
+ * needed. This event could be used for flow control
+ * between the host and the device.
+ */
+ break;
+ default:
+ dev_dbg(&port->dev, "Unexpected event\n");
+ break;
+ }
+}
+
+/*
+ * One URB can contain data for multiple ports. Demultiplex the data,
+ * checking the port exists, is opened and the message is valid.
+ */
+static void mxuport_process_read_urb_demux_data(struct urb *urb)
+{
+ struct usb_serial_port *port = urb->context;
+ struct usb_serial *serial = port->serial;
+ u8 *data = urb->transfer_buffer;
+ u8 *end = data + urb->actual_length;
+ struct usb_serial_port *demux_port;
+ u8 *ch;
+ u16 rcv_port;
+ u16 rcv_len;
+
+ while (data < end) {
+ if (data + HEADER_SIZE > end) {
+ dev_warn(&port->dev, "%s - message with short header\n",
+ __func__);
+ return;
+ }
+
+ rcv_port = get_unaligned_be16(data);
+ if (rcv_port >= serial->num_ports) {
+ dev_warn(&port->dev, "%s - message for invalid port\n",
+ __func__);
+ return;
+ }
+
+ demux_port = serial->port[rcv_port];
+ rcv_len = get_unaligned_be16(data + 2);
+ if (!rcv_len || data + HEADER_SIZE + rcv_len > end) {
+ dev_warn(&port->dev, "%s - short data\n", __func__);
+ return;
+ }
+
+ if (test_bit(ASYNCB_INITIALIZED, &demux_port->port.flags)) {
+ ch = data + HEADER_SIZE;
+ mxuport_process_read_urb_data(demux_port, ch, rcv_len);
+ } else {
+ dev_dbg(&demux_port->dev, "%s - data for closed port\n",
+ __func__);
+ }
+ data += HEADER_SIZE + rcv_len;
+ }
+}
+
+/*
+ * One URB can contain events for multiple ports. Demultiplex the event,
+ * checking the port exists, and is opened.
+ */
+static void mxuport_process_read_urb_demux_event(struct urb *urb)
+{
+ struct usb_serial_port *port = urb->context;
+ struct usb_serial *serial = port->serial;
+ u8 *data = urb->transfer_buffer;
+ u8 *end = data + urb->actual_length;
+ struct usb_serial_port *demux_port;
+ u8 *ch;
+ u16 rcv_port;
+ u16 rcv_event;
+
+ while (data < end) {
+ if (data + EVENT_LENGTH > end) {
+ dev_warn(&port->dev, "%s - message with short event\n",
+ __func__);
+ return;
+ }
+
+ rcv_port = get_unaligned_be16(data);
+ if (rcv_port >= serial->num_ports) {
+ dev_warn(&port->dev, "%s - message for invalid port\n",
+ __func__);
+ return;
+ }
+
+ demux_port = serial->port[rcv_port];
+ if (test_bit(ASYNCB_INITIALIZED, &demux_port->port.flags)) {
+ ch = data + HEADER_SIZE;
+ rcv_event = get_unaligned_be16(data + 2);
+ mxuport_process_read_urb_event(demux_port, ch,
+ rcv_event);
+ } else {
+ dev_dbg(&demux_port->dev,
+ "%s - event for closed port\n", __func__);
+ }
+ data += EVENT_LENGTH;
+ }
+}
+
+/*
+ * This is called when we have received data on the bulk in
+ * endpoint. Depending on which port it was received on, it can
+ * contain serial data or events.
+ */
+static void mxuport_process_read_urb(struct urb *urb)
+{
+ struct usb_serial_port *port = urb->context;
+ struct usb_serial *serial = port->serial;
+
+ if (port == serial->port[0])
+ mxuport_process_read_urb_demux_data(urb);
+
+ if (port == serial->port[1])
+ mxuport_process_read_urb_demux_event(urb);
+}
+
+/*
+ * Ask the device how many bytes it has queued to be sent out. If
+ * there are none, return true.
+ */
+static bool mxuport_tx_empty(struct usb_serial_port *port)
+{
+ struct usb_serial *serial = port->serial;
+ bool is_empty = true;
+ u32 txlen;
+ u8 *len_buf;
+ int err;
+
+ len_buf = kzalloc(4, GFP_KERNEL);
+ if (!len_buf)
+ goto out;
+
+ err = mxuport_recv_ctrl_urb(serial, RQ_VENDOR_GET_OUTQUEUE, 0,
+ port->port_number, len_buf, 4);
+ if (err < 0)
+ goto out;
+
+ txlen = get_unaligned_be32(len_buf);
+ dev_dbg(&port->dev, "%s - tx len = %u\n", __func__, txlen);
+
+ if (txlen != 0)
+ is_empty = false;
+
+out:
+ kfree(len_buf);
+ return is_empty;
+}
+
+static int mxuport_set_mcr(struct usb_serial_port *port, u8 mcr_state)
+{
+ struct usb_serial *serial = port->serial;
+ int err;
+
+ dev_dbg(&port->dev, "%s - %02x\n", __func__, mcr_state);
+
+ err = mxuport_send_ctrl_urb(serial, RQ_VENDOR_SET_MCR,
+ mcr_state, port->port_number);
+ if (err)
+ dev_err(&port->dev, "%s - failed to change MCR\n", __func__);
+
+ return err;
+}
+
+static int mxuport_set_dtr(struct usb_serial_port *port, int on)
+{
+ struct mxuport_port *mxport = usb_get_serial_port_data(port);
+ struct usb_serial *serial = port->serial;
+ int err;
+
+ mutex_lock(&mxport->mutex);
+
+ err = mxuport_send_ctrl_urb(serial, RQ_VENDOR_SET_DTR,
+ !!on, port->port_number);
+ if (!err) {
+ if (on)
+ mxport->mcr_state |= UART_MCR_DTR;
+ else
+ mxport->mcr_state &= ~UART_MCR_DTR;
+ }
+
+ mutex_unlock(&mxport->mutex);
+
+ return err;
+}
+
+static int mxuport_set_rts(struct usb_serial_port *port, u8 state)
+{
+ struct mxuport_port *mxport = usb_get_serial_port_data(port);
+ struct usb_serial *serial = port->serial;
+ int err;
+ u8 mcr_state;
+
+ mutex_lock(&mxport->mutex);
+ mcr_state = mxport->mcr_state;
+
+ switch (state) {
+ case MX_RTS_DISABLE:
+ mcr_state &= ~UART_MCR_RTS;
+ break;
+ case MX_RTS_ENABLE:
+ mcr_state |= UART_MCR_RTS;
+ break;
+ case MX_RTS_HW:
+ /*
+ * Do not update mxport->mcr_state when doing hardware
+ * flow control.
+ */
+ break;
+ default:
+ /*
+ * Should not happen, but somebody might try passing
+ * MX_RTS_NO_CHANGE, which is not valid.
+ */
+ err = -EINVAL;
+ goto out;
+ }
+ err = mxuport_send_ctrl_urb(serial, RQ_VENDOR_SET_RTS,
+ state, port->port_number);
+ if (!err)
+ mxport->mcr_state = mcr_state;
+
+out:
+ mutex_unlock(&mxport->mutex);
+
+ return err;
+}
+
+static void mxuport_dtr_rts(struct usb_serial_port *port, int on)
+{
+ struct mxuport_port *mxport = usb_get_serial_port_data(port);
+ u8 mcr_state;
+ int err;
+
+ mutex_lock(&mxport->mutex);
+ mcr_state = mxport->mcr_state;
+
+ if (on)
+ mcr_state |= (UART_MCR_RTS | UART_MCR_DTR);
+ else
+ mcr_state &= ~(UART_MCR_RTS | UART_MCR_DTR);
+
+ err = mxuport_set_mcr(port, mcr_state);
+ if (!err)
+ mxport->mcr_state = mcr_state;
+
+ mutex_unlock(&mxport->mutex);
+}
+
+static int mxuport_tiocmset(struct tty_struct *tty, unsigned int set,
+ unsigned int clear)
+{
+ struct usb_serial_port *port = tty->driver_data;
+ struct mxuport_port *mxport = usb_get_serial_port_data(port);
+ int err;
+ u8 mcr_state;
+
+ mutex_lock(&mxport->mutex);
+ mcr_state = mxport->mcr_state;
+
+ if (set & TIOCM_RTS)
+ mcr_state |= UART_MCR_RTS;
+
+ if (set & TIOCM_DTR)
+ mcr_state |= UART_MCR_DTR;
+
+ if (clear & TIOCM_RTS)
+ mcr_state &= ~UART_MCR_RTS;
+
+ if (clear & TIOCM_DTR)
+ mcr_state &= ~UART_MCR_DTR;
+
+ err = mxuport_set_mcr(port, mcr_state);
+ if (!err)
+ mxport->mcr_state = mcr_state;
+
+ mutex_unlock(&mxport->mutex);
+
+ return err;
+}
+
+static int mxuport_tiocmget(struct tty_struct *tty)
+{
+ struct mxuport_port *mxport;
+ struct usb_serial_port *port = tty->driver_data;
+ unsigned int result;
+ unsigned long flags;
+ unsigned int msr;
+ unsigned int mcr;
+
+ mxport = usb_get_serial_port_data(port);
+
+ mutex_lock(&mxport->mutex);
+ spin_lock_irqsave(&mxport->spinlock, flags);
+
+ msr = mxport->msr_state;
+ mcr = mxport->mcr_state;
+
+ spin_unlock_irqrestore(&mxport->spinlock, flags);
+ mutex_unlock(&mxport->mutex);
+
+ result = (((mcr & UART_MCR_DTR) ? TIOCM_DTR : 0) | /* 0x002 */
+ ((mcr & UART_MCR_RTS) ? TIOCM_RTS : 0) | /* 0x004 */
+ ((msr & UART_MSR_CTS) ? TIOCM_CTS : 0) | /* 0x020 */
+ ((msr & UART_MSR_DCD) ? TIOCM_CAR : 0) | /* 0x040 */
+ ((msr & UART_MSR_RI) ? TIOCM_RI : 0) | /* 0x080 */
+ ((msr & UART_MSR_DSR) ? TIOCM_DSR : 0)); /* 0x100 */
+
+ dev_dbg(&port->dev, "%s - 0x%04x\n", __func__, result);
+
+ return result;
+}
+
+static int mxuport_set_termios_flow(struct tty_struct *tty,
+ struct ktermios *old_termios,
+ struct usb_serial_port *port,
+ struct usb_serial *serial)
+{
+ u8 xon = START_CHAR(tty);
+ u8 xoff = STOP_CHAR(tty);
+ int enable;
+ int err;
+ u8 *buf;
+ u8 rts;
+
+ buf = kmalloc(2, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ /* S/W flow control settings */
+ if (I_IXOFF(tty) || I_IXON(tty)) {
+ enable = 1;
+ buf[0] = xon;
+ buf[1] = xoff;
+
+ err = mxuport_send_ctrl_data_urb(serial, RQ_VENDOR_SET_CHARS,
+ 0, port->port_number,
+ buf, 2);
+ if (err)
+ goto out;
+
+ dev_dbg(&port->dev, "%s - XON = 0x%02x, XOFF = 0x%02x\n",
+ __func__, xon, xoff);
+ } else {
+ enable = 0;
+ }
+
+ err = mxuport_send_ctrl_urb(serial, RQ_VENDOR_SET_XONXOFF,
+ enable, port->port_number);
+ if (err)
+ goto out;
+
+ rts = MX_RTS_NO_CHANGE;
+
+ /* H/W flow control settings */
+ if (!old_termios ||
+ C_CRTSCTS(tty) != (old_termios->c_cflag & CRTSCTS)) {
+ if (C_CRTSCTS(tty))
+ rts = MX_RTS_HW;
+ else
+ rts = MX_RTS_ENABLE;
+ }
+
+ if (C_BAUD(tty)) {
+ if (old_termios && (old_termios->c_cflag & CBAUD) == B0) {
+ /* Raise DTR and RTS */
+ if (C_CRTSCTS(tty))
+ rts = MX_RTS_HW;
+ else
+ rts = MX_RTS_ENABLE;
+ mxuport_set_dtr(port, 1);
+ }
+ } else {
+ /* Drop DTR and RTS */
+ rts = MX_RTS_DISABLE;
+ mxuport_set_dtr(port, 0);
+ }
+
+ if (rts != MX_RTS_NO_CHANGE)
+ err = mxuport_set_rts(port, rts);
+
+out:
+ kfree(buf);
+ return err;
+}
+
+static void mxuport_set_termios(struct tty_struct *tty,
+ struct usb_serial_port *port,
+ struct ktermios *old_termios)
+{
+ struct usb_serial *serial = port->serial;
+ u8 *buf;
+ u8 data_bits;
+ u8 stop_bits;
+ u8 parity;
+ int baud;
+ int err;
+
+ if (old_termios &&
+ !tty_termios_hw_change(&tty->termios, old_termios) &&
+ tty->termios.c_iflag == old_termios->c_iflag) {
+ dev_dbg(&port->dev, "%s - nothing to change\n", __func__);
+ return;
+ }
+
+ buf = kmalloc(4, GFP_KERNEL);
+ if (!buf)
+ return;
+
+ /* Set data bit of termios */
+ switch (C_CSIZE(tty)) {
+ case CS5:
+ data_bits = MX_WORDLENGTH_5;
+ break;
+ case CS6:
+ data_bits = MX_WORDLENGTH_6;
+ break;
+ case CS7:
+ data_bits = MX_WORDLENGTH_7;
+ break;
+ case CS8:
+ default:
+ data_bits = MX_WORDLENGTH_8;
+ break;
+ }
+
+ /* Set parity of termios */
+ if (C_PARENB(tty)) {
+ if (C_CMSPAR(tty)) {
+ if (C_PARODD(tty))
+ parity = MX_PARITY_MARK;
+ else
+ parity = MX_PARITY_SPACE;
+ } else {
+ if (C_PARODD(tty))
+ parity = MX_PARITY_ODD;
+ else
+ parity = MX_PARITY_EVEN;
+ }
+ } else {
+ parity = MX_PARITY_NONE;
+ }
+
+ /* Set stop bit of termios */
+ if (C_CSTOPB(tty))
+ stop_bits = MX_STOP_BITS_2;
+ else
+ stop_bits = MX_STOP_BITS_1;
+
+ buf[0] = data_bits;
+ buf[1] = parity;
+ buf[2] = stop_bits;
+ buf[3] = 0;
+
+ err = mxuport_send_ctrl_data_urb(serial, RQ_VENDOR_SET_LINE,
+ 0, port->port_number, buf, 4);
+ if (err)
+ goto out;
+
+ err = mxuport_set_termios_flow(tty, old_termios, port, serial);
+ if (err)
+ goto out;
+
+ baud = tty_get_baud_rate(tty);
+ if (!baud)
+ baud = 9600;
+
+ /* Note: Little Endian */
+ put_unaligned_le32(baud, buf);
+
+ err = mxuport_send_ctrl_data_urb(serial, RQ_VENDOR_SET_BAUD,
+ 0, port->port_number,
+ buf, 4);
+ if (err)
+ goto out;
+
+ dev_dbg(&port->dev, "baud_rate : %d\n", baud);
+ dev_dbg(&port->dev, "data_bits : %d\n", data_bits);
+ dev_dbg(&port->dev, "parity : %d\n", parity);
+ dev_dbg(&port->dev, "stop_bits : %d\n", stop_bits);
+
+out:
+ kfree(buf);
+}
+
+/*
+ * Determine how many ports this device has dynamically. It will be
+ * called after the probe() callback is called, but before attach().
+ */
+static int mxuport_calc_num_ports(struct usb_serial *serial)
+{
+ unsigned long features = (unsigned long)usb_get_serial_data(serial);
+
+ if (features & MX_UPORT_2_PORT)
+ return 2;
+ if (features & MX_UPORT_4_PORT)
+ return 4;
+ if (features & MX_UPORT_8_PORT)
+ return 8;
+ if (features & MX_UPORT_16_PORT)
+ return 16;
+
+ return 0;
+}
+
+/* Get the version of the firmware currently running. */
+static int mxuport_get_fw_version(struct usb_serial *serial, u32 *version)
+{
+ u8 *ver_buf;
+ int err;
+
+ ver_buf = kzalloc(4, GFP_KERNEL);
+ if (!ver_buf)
+ return -ENOMEM;
+
+ /* Get firmware version from SDRAM */
+ err = mxuport_recv_ctrl_urb(serial, RQ_VENDOR_GET_VERSION, 0, 0,
+ ver_buf, 4);
+ if (err != 4) {
+ err = -EIO;
+ goto out;
+ }
+
+ *version = (ver_buf[0] << 16) | (ver_buf[1] << 8) | ver_buf[2];
+ err = 0;
+out:
+ kfree(ver_buf);
+ return err;
+}
+
+/* Given a firmware blob, download it to the device. */
+static int mxuport_download_fw(struct usb_serial *serial,
+ const struct firmware *fw_p)
+{
+ u8 *fw_buf;
+ size_t txlen;
+ size_t fwidx;
+ int err;
+
+ fw_buf = kmalloc(DOWN_BLOCK_SIZE, GFP_KERNEL);
+ if (!fw_buf)
+ return -ENOMEM;
+
+ dev_dbg(&serial->interface->dev, "Starting firmware download...\n");
+ err = mxuport_send_ctrl_urb(serial, RQ_VENDOR_START_FW_DOWN, 0, 0);
+ if (err)
+ goto out;
+
+ fwidx = 0;
+ do {
+ txlen = min_t(size_t, (fw_p->size - fwidx), DOWN_BLOCK_SIZE);
+
+ memcpy(fw_buf, &fw_p->data[fwidx], txlen);
+ err = mxuport_send_ctrl_data_urb(serial, RQ_VENDOR_FW_DATA,
+ 0, 0, fw_buf, txlen);
+ if (err) {
+ mxuport_send_ctrl_urb(serial, RQ_VENDOR_STOP_FW_DOWN,
+ 0, 0);
+ goto out;
+ }
+
+ fwidx += txlen;
+ usleep_range(1000, 2000);
+
+ } while (fwidx < fw_p->size);
+
+ msleep(1000);
+ err = mxuport_send_ctrl_urb(serial, RQ_VENDOR_STOP_FW_DOWN, 0, 0);
+ if (err)
+ goto out;
+
+ msleep(1000);
+ err = mxuport_send_ctrl_urb(serial, RQ_VENDOR_QUERY_FW_READY, 0, 0);
+
+out:
+ kfree(fw_buf);
+ return err;
+}
+
+static int mxuport_probe(struct usb_serial *serial,
+ const struct usb_device_id *id)
+{
+ u16 productid = le16_to_cpu(serial->dev->descriptor.idProduct);
+ const struct firmware *fw_p = NULL;
+ u32 version;
+ int local_ver;
+ char buf[32];
+ int err;
+
+ /* Load our firmware */
+ err = mxuport_send_ctrl_urb(serial, RQ_VENDOR_QUERY_FW_CONFIG, 0, 0);
+ if (err) {
+ mxuport_send_ctrl_urb(serial, RQ_VENDOR_RESET_DEVICE, 0, 0);
+ return err;
+ }
+
+ err = mxuport_get_fw_version(serial, &version);
+ if (err < 0)
+ return err;
+
+ dev_dbg(&serial->interface->dev, "Device firmware version v%x.%x.%x\n",
+ (version & 0xff0000) >> 16,
+ (version & 0xff00) >> 8,
+ (version & 0xff));
+
+ snprintf(buf, sizeof(buf) - 1, "moxa/moxa-%04x.fw", productid);
+
+ err = request_firmware(&fw_p, buf, &serial->interface->dev);
+ if (err) {
+ dev_warn(&serial->interface->dev, "Firmware %s not found\n",
+ buf);
+
+ /* Use the firmware already in the device */
+ err = 0;
+ } else {
+ local_ver = ((fw_p->data[VER_ADDR_1] << 16) |
+ (fw_p->data[VER_ADDR_2] << 8) |
+ fw_p->data[VER_ADDR_3]);
+ dev_dbg(&serial->interface->dev,
+ "Available firmware version v%x.%x.%x\n",
+ fw_p->data[VER_ADDR_1], fw_p->data[VER_ADDR_2],
+ fw_p->data[VER_ADDR_3]);
+ if (local_ver > version) {
+ err = mxuport_download_fw(serial, fw_p);
+ if (err)
+ goto out;
+ err = mxuport_get_fw_version(serial, &version);
+ if (err < 0)
+ goto out;
+ }
+ }
+
+ dev_info(&serial->interface->dev,
+ "Using device firmware version v%x.%x.%x\n",
+ (version & 0xff0000) >> 16,
+ (version & 0xff00) >> 8,
+ (version & 0xff));
+
+ /*
+ * Contains the features of this hardware. Store away for
+ * later use, eg, number of ports.
+ */
+ usb_set_serial_data(serial, (void *)id->driver_info);
+out:
+ if (fw_p)
+ release_firmware(fw_p);
+ return err;
+}
+
+
+static int mxuport_port_probe(struct usb_serial_port *port)
+{
+ struct usb_serial *serial = port->serial;
+ struct mxuport_port *mxport;
+ int err;
+
+ mxport = devm_kzalloc(&port->dev, sizeof(struct mxuport_port),
+ GFP_KERNEL);
+ if (!mxport)
+ return -ENOMEM;
+
+ mutex_init(&mxport->mutex);
+ spin_lock_init(&mxport->spinlock);
+
+ /* Set the port private data */
+ usb_set_serial_port_data(port, mxport);
+
+ /* Set FIFO (Enable) */
+ err = mxuport_send_ctrl_urb(serial, RQ_VENDOR_SET_FIFO_DISABLE,
+ 0, port->port_number);
+ if (err)
+ return err;
+
+ /* Set transmission mode (Hi-Performance) */
+ err = mxuport_send_ctrl_urb(serial, RQ_VENDOR_SET_HIGH_PERFOR,
+ 0, port->port_number);
+ if (err)
+ return err;
+
+ /* Set interface (RS-232) */
+ err = mxuport_send_ctrl_urb(serial, RQ_VENDOR_SET_INTERFACE,
+ MX_INT_RS232,
+ port->port_number);
+ if (err)
+ return err;
+
+ return 0;
+}
+
+static int mxuport_alloc_write_urb(struct usb_serial *serial,
+ struct usb_serial_port *port,
+ struct usb_serial_port *port0,
+ int j)
+{
+ struct usb_device *dev = interface_to_usbdev(serial->interface);
+
+ set_bit(j, &port->write_urbs_free);
+ port->write_urbs[j] = usb_alloc_urb(0, GFP_KERNEL);
+ if (!port->write_urbs[j])
+ return -ENOMEM;
+
+ port->bulk_out_buffers[j] = kmalloc(port0->bulk_out_size, GFP_KERNEL);
+ if (!port->bulk_out_buffers[j])
+ return -ENOMEM;
+
+ usb_fill_bulk_urb(port->write_urbs[j], dev,
+ usb_sndbulkpipe(dev, port->bulk_out_endpointAddress),
+ port->bulk_out_buffers[j],
+ port->bulk_out_size,
+ serial->type->write_bulk_callback,
+ port);
+ return 0;
+}
+
+
+static int mxuport_alloc_write_urbs(struct usb_serial *serial,
+ struct usb_serial_port *port,
+ struct usb_serial_port *port0)
+{
+ int j;
+ int ret;
+
+ for (j = 0; j < ARRAY_SIZE(port->write_urbs); ++j) {
+ ret = mxuport_alloc_write_urb(serial, port, port0, j);
+ if (ret)
+ return ret;
+ }
+ return 0;
+}
+
+
+static int mxuport_attach(struct usb_serial *serial)
+{
+ struct usb_serial_port *port0 = serial->port[0];
+ struct usb_serial_port *port1 = serial->port[1];
+ struct usb_serial_port *port;
+ int err;
+ int i;
+ int j;
+
+ /*
+ * Throw away all but the first allocated write URBs so we can
+ * set them up again to fit the multiplexing scheme.
+ */
+ for (i = 1; i < serial->num_bulk_out; ++i) {
+ port = serial->port[i];
+ for (j = 0; j < ARRAY_SIZE(port->write_urbs); ++j) {
+ usb_free_urb(port->write_urbs[j]);
+ kfree(port->bulk_out_buffers[j]);
+ port->write_urbs[j] = NULL;
+ port->bulk_out_buffers[j] = NULL;
+ }
+ port->write_urbs_free = 0;
+ }
+
+ /*
+ * All write data is sent over the first bulk out endpoint,
+ * with an added header to indicate the port. Allocate URBs
+ * for each port to the first bulk out endpoint.
+ */
+ for (i = 1; i < serial->num_ports; ++i) {
+ port = serial->port[i];
+ port->bulk_out_size = port0->bulk_out_size;
+ port->bulk_out_endpointAddress =
+ port0->bulk_out_endpointAddress;
+
+ err = mxuport_alloc_write_urbs(serial, port, port0);
+ if (err)
+ return err;
+
+ port->write_urb = port->write_urbs[0];
+ port->bulk_out_buffer = port->bulk_out_buffers[0];
+
+ /*
+ * Ensure each port has a fifo. The framework only
+ * allocates a fifo to ports with a bulk out endpoint,
+ * where as we need one for every port.
+ */
+ if (!kfifo_initialized(&port->write_fifo)) {
+ err = kfifo_alloc(&port->write_fifo, PAGE_SIZE,
+ GFP_KERNEL);
+ if (err)
+ return err;
+ }
+ }
+
+ /*
+ * All data from the ports is received on the first bulk in
+ * endpoint, with a multiplex header. The second bulk in is
+ * used for events.
+ *
+ * Start to read from the device.
+ */
+ err = usb_serial_generic_submit_read_urbs(port0, GFP_KERNEL);
+ if (err)
+ return err;
+
+ err = usb_serial_generic_submit_read_urbs(port1, GFP_KERNEL);
+ if (err) {
+ usb_serial_generic_close(port0);
+ return err;
+ }
+
+ return 0;
+}
+
+static int mxuport_open(struct tty_struct *tty, struct usb_serial_port *port)
+{
+ struct mxuport_port *mxport = usb_get_serial_port_data(port);
+ struct usb_serial *serial = port->serial;
+ int err;
+
+ /* Set receive host (enable) */
+ err = mxuport_send_ctrl_urb(serial, RQ_VENDOR_SET_RX_HOST_EN,
+ 1, port->port_number);
+ if (err)
+ return err;
+
+ err = mxuport_send_ctrl_urb(serial, RQ_VENDOR_SET_OPEN,
+ 1, port->port_number);
+ if (err) {
+ mxuport_send_ctrl_urb(serial, RQ_VENDOR_SET_RX_HOST_EN,
+ 0, port->port_number);
+ return err;
+ }
+
+ /* Initial port termios */
+ mxuport_set_termios(tty, port, NULL);
+
+ /*
+ * TODO: use RQ_VENDOR_GET_MSR, once we know what it
+ * returns.
+ */
+ mxport->msr_state = 0;
+
+ return err;
+}
+
+static void mxuport_close(struct usb_serial_port *port)
+{
+ struct usb_serial *serial = port->serial;
+
+ mxuport_send_ctrl_urb(serial, RQ_VENDOR_SET_OPEN, 0,
+ port->port_number);
+
+ mxuport_send_ctrl_urb(serial, RQ_VENDOR_SET_RX_HOST_EN, 0,
+ port->port_number);
+}
+
+/* Send a break to the port. */
+static void mxuport_break_ctl(struct tty_struct *tty, int break_state)
+{
+ struct usb_serial_port *port = tty->driver_data;
+ struct usb_serial *serial = port->serial;
+ int enable;
+
+ if (break_state == -1) {
+ enable = 1;
+ dev_dbg(&port->dev, "%s - sending break\n", __func__);
+ } else {
+ enable = 0;
+ dev_dbg(&port->dev, "%s - clearing break\n", __func__);
+ }
+
+ mxuport_send_ctrl_urb(serial, RQ_VENDOR_SET_BREAK,
+ enable, port->port_number);
+}
+
+static int mxuport_resume(struct usb_serial *serial)
+{
+ struct usb_serial_port *port;
+ int c = 0;
+ int i;
+ int r;
+
+ for (i = 0; i < 2; i++) {
+ port = serial->port[i];
+
+ r = usb_serial_generic_submit_read_urbs(port, GFP_NOIO);
+ if (r < 0)
+ c++;
+ }
+
+ for (i = 0; i < serial->num_ports; i++) {
+ port = serial->port[i];
+ if (!test_bit(ASYNCB_INITIALIZED, &port->port.flags))
+ continue;
+
+ r = usb_serial_generic_write_start(port, GFP_NOIO);
+ if (r < 0)
+ c++;
+ }
+
+ return c ? -EIO : 0;
+}
+
+static struct usb_serial_driver mxuport_device = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "mxuport",
+ },
+ .description = "MOXA UPort",
+ .id_table = mxuport_idtable,
+ .num_ports = 0,
+ .probe = mxuport_probe,
+ .port_probe = mxuport_port_probe,
+ .attach = mxuport_attach,
+ .calc_num_ports = mxuport_calc_num_ports,
+ .open = mxuport_open,
+ .close = mxuport_close,
+ .set_termios = mxuport_set_termios,
+ .break_ctl = mxuport_break_ctl,
+ .tx_empty = mxuport_tx_empty,
+ .tiocmiwait = usb_serial_generic_tiocmiwait,
+ .get_icount = usb_serial_generic_get_icount,
+ .throttle = mxuport_throttle,
+ .unthrottle = mxuport_unthrottle,
+ .tiocmget = mxuport_tiocmget,
+ .tiocmset = mxuport_tiocmset,
+ .dtr_rts = mxuport_dtr_rts,
+ .process_read_urb = mxuport_process_read_urb,
+ .prepare_write_buffer = mxuport_prepare_write_buffer,
+ .resume = mxuport_resume,
+};
+
+static struct usb_serial_driver *const serial_drivers[] = {
+ &mxuport_device, NULL
+};
+
+module_usb_serial_driver(serial_drivers, mxuport_idtable);
+
+MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>");
+MODULE_AUTHOR("<support@moxa.com>");
+MODULE_LICENSE("GPL");
projects / GitHub / moto-9609 / android_kernel_motorola_exynos9610.git / commitdiff